These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
After the opening credits there's a scene where a pair of Batgirls witness a man being mugged and then killed. The scene then cuts to a dance club and the murder is never brought up again.note To be fair, they're reporting the crime to the police, and are witnesses. Batwoman has made it clear she doesn't want her people endangering themselves.
There's also the "synthetic vampires" opening (thrown in to placate the rabid lawyers of DC/National Comics) and the racist seance scene. Along with, y'know, everything else in the movie.
Another scene has a random man walk into a dark office, a phone suddenly rings, and he answers it and reports that everything is in order. Who he is, where he is, who he is talking to, and what it has to do with anything is never explained. Apparently, he's the security guard. Unfortunately, he's also stock footage from another movie, as are the muggers, the Mole People, that trenchcoat guy, some of Rat Fink and some establishing shots.